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Application filed by Fridrich Ing Berkes, Ladislav Ing MelegfiledCriticalFridrich Ing Berkes
Priority to CS857325ApriorityCriticalpatent/CS252743B1/en
Publication of CS732585A1publicationCriticalpatent/CS732585A1/en
Publication of CS252743B1publicationCriticalpatent/CS252743B1/en